Fire extinguisher



Sept. 4, 1928. 1,682,833

C. W. DAKE FIRE EXTINGUISHER Filed May 11, 1925 2 Sheets-Sheet 2 III,

BY Q's-A18 ATTORNEY.)

Patented Sept. 4, 1928.

NITED srATss WARE-7E5 W. EMF, WP CHIGAGU, ELEINOIB,

mas ism'msursm.

application filed May 11, 1925. serial No-. 29,291.

My invention relates to improvements in fire extinguishers andparticularly to a fire extinguisher which will go into operation when apredetermined temperature has been reached. My extinguisher isparticularly adapted for use in connection with automobiles and isprimarily intended to be located under the hood of an automobile, inimmediatejuxtaposition to the en ine so that in the 1.1 event that afire starts at t at critical point the extinguisher may automatically gointo action even before the operator is aware of it. Other objects of myinvention willappear from time to time throughout the specification andclaims.

My invention is illustrated more or less diagrammatically in theaccompanying drawin s wherein-- lgure 1 is a plan vlew; Figure 2' is asection alongthe line 2-2 of Fi re 1' igure 3 is a section along theline 3-3 of Fi re 2, showing the fire extinguisher after it as gone intooperation;

Figure 4 is a section along the lme 44 of Fi re 2;

igure 5 is an elevation of the combined In and bottle support; j igure 6is a top plan view of the support so shown in Figure 5- Figure 7 is adiagrammatic showing 1n section of an automobile hood with engme andextinguisher in place.

Like parts are indlcated by like characters throughout the specificationand drawings.

A is an automobile dash board. A 1s a bracket bolted or otherwiseattached to the front side thereof within the hood enclosing the engine.A A are lugs projecting forwardly from the bracket or plate A havmg pinsA projecting upwardly therefrom an adapted to be engaged by and supportperforate cars A A projecting from the housing A", which housing restsagainst the lu s A The housing A is closed at the top and as at.

the bottom an open mouth surrounded by a flange or collar B. Slidable inthis flange or collar B is a cylindrical plug B havmg lugs B adapted topass through channels B in the collar B to permit the plug to be placedin position, the plug being then rotated to move the lugs B out of linewith the channels B to limit downward movement of the plug. The plug 13is flanged at B and slotted at B. The flange B is normally soldered inplace in engagement with the underslde of the collar B to hold the partsin inoperatlve position. The collar B is perforated at B and theseperforations register with the slots B so that when the plug is in thelower position shown in Figure 3 there is a passage through theperforations B"; the slots B and the space between the flange B and thelower wall of the collar Bwhereby fire extinguishing fluid may pass outfrom the interlor of the container A and be discharged from thereceptacle in a generally horizontal direction. Projecting upwardly fromthe plug B are fingers B adapted to hold and an port a bottle B whichmay contain an aci or other suitable chemical. The plug has a downwardlyextending cup B perforate at the bottom and open at the top. Shdable inthis cup is a plunger B having a stem B traveling in the perforation atthe bottom of the cup. A spring B is contained within the cupsurrounding the stem and compressed between the plun er and the bottomof the cup being held un er com ression by a solder seal B which holds te plunger and stem in the retracted position with the spring undercompression. Closing the bot tom of the cup and protecting the plungeris a thin cap B which is placed there in order to protect the stem andthe solder during installation and while the device is in theinoperative position.

The housing itself contains a chemical which when mixed with thechemical in the glass bottle exerts a pressure and forms an inert orfire extinguishing gas or liquid or foam as the case may be. The solderholding the stem in place is adpted to melt when a temperature ofapproximately two hundred degrees is reached. The solder holding theplug in place is adapted to melt when a temerature of three hundreddegrees is reached.

he solder seal holding the plug in place is of such strength that whenthe glass bottle is broken the chemicals mixing will set up a pressuresuflicient to break the solder seal and permit the plug to drop down andallow liquid or gas to rush out from the container or housing.

This container as a unit assembled in the relation shown in Figure 2 maybe placed under the hood of an automobile or in any other suitable placewhere fire protection is desired. The cap at the bottom protects the pinor stem and the solder from accidental 110 release or distortion. If thetemperature surrounding the fire extinguishing unit reaches a pointsuflicient to melt the solder or other material holdin the stem in theretracted position, the seal is broken, the spring is then released andthe plunger is thrown violently upward into the position shown in Figure3 breaking the bottle which is of glass or other suitable material andallowing t e two chemicals to mix. The pressure exerted is sufiicient toforce the plug down breaking the outer solder seal, the chemicals fromthe container then rush out through the space surrounding the plug andare dischar ed in a horizontal position at the bottom of tie plug.Leakage of the chemical through the center of the plug is preventedbecause the lun er is normally at all times in contact with the cup andthe pressure exerted upon the plug will only tend to compress t espring. The fire extinguishing chemical thrown out violently in agenerally horizontal direction will of course be effectively distributedthroughout the area surrounding the fire extinguisher and if this fireextinguisher is located in an automobile hood, it will fill the hoodwith a non-combustible as puttin out the fire and at the same timebringing are engine to a stop because the automobile engine Which drawsits air to support combustion from beneath the hood will under suchconditions instead of drawing in air will draw in the inert gas whichextinguishes the fire and will not su port combustion in the engine.Thus t e re is put out and the driver is automatical- 2 V I '1,eaa,aaa

1y apprised of the fact that something has gone wrong,-

I claim:

1. In an automatic fire extinguisher, an outer casin and means forsupporting it, said casing aving an aperture in the lower part thereof,a closure for said aperture and a securing means therefor, a container,mounted within said outer casing, and a fire extinguishing substancetherein, means for releasing said substance in response to apredetermined rise in temperature, said substance, when released, beingadapted to create sufficient pressure to break the securing means andrelease the closure.

2. In an automatic fire extinguisher, and outer casin and means forsupporting it, said casing aving an aperture in the lower part thereof,a closure for said aperture and a securing means therefor, a container,mounted within said outer casing, and a fire extinguishing substancetherein, means for releasing said substance in response to a predetermined rise in temperature, said substance, when released, bemgadapted to create sufiicient ressure to break the securing means and reease the closure means on said closure for setting a predetermined limitto its movement after release and lateral deflecting means on saidclosure ada ted laterally to discharge the fire extinguishing substancepassing throu h the closure.

Signed at hicago, county of Cook and State of Illinois, this 24th day ofApril, 1925.

CHARLES W. DAKE.

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